Getting started. Creating a simple Modbus protocol application

Transcription

1 Getting started Creating a simple Modbus protocol application

2 Document revision Date Edition Comments 24/11/ /11/ Sielco Sistemi srl via Roma, 24 I Guanzate (CO) Getting started - Creating a simple Modbus protocol application 2

3 1. Introduction In this guide we propose, as an example, the design of a simple supervision application Modbus RTU protocol based; this example is a little step towards the design of more complex SCADA applications, but it can be useful for anybody who approaches for the first time to a SCADA, and in particular to Winlog Pro software, to quickly understand how to communicate with external devices. Every time you design a new application, it is necessary to know, for each external device, the communication protocol, the address and the list of variables that you want read or write. In our example we have to communicate with two devices (Test Device#1 e Test Device#2) whose address are 1 and 2; for each device we want to read 3 numeric variables (Temp, Sp e Out) and 1 digital variable (Alarm). Getting started - Creating a simple Modbus protocol application 3

4 2. Creating the project To create a new supervision project, it is necessary to use Project Manager, the Winlog Pro integrated development environment that provides different tools (Gate Builder, Template Builder, Code Builder). Run Project Manager selecting own icon from Start menu. Select New from Project menu and insert the project name (for example Test). Project creation In this way you create a tree structure with all supervision project elements. Getting started - Creating a simple Modbus protocol application 4

5 3. Communication channel configuration From elements in Configuration folder select Channels. Define the logic channel 1 to communicate in Modbus RTU. Protocol selection Press button Options... and select the serial port to assign to the channel (for example COM1). It is necessary to set serial port specifying Baud rate, Parity, Stop bits, Data bits, Time out e Query Pause (for these parameters refer to manufacturer data device, an example is provided in the figure) Protocol configuration Getting started - Creating a simple Modbus protocol application 5

6 4. Devices declaration From elements in Configuration folder select Devices. Insert Test Device#1 and Test Device#2, respectively at address 1 and 2 on logic channel 1 previously set Devices declaration Getting started - Creating a simple Modbus protocol application 6

7 5. Creating variables database Now we can insert the devices variables in gates database In this example we only consider numeric and digital variables (gates). Numeric gates include all those variables that refer to an analog quantity (for example measured variables, setpoints, alarm threshold..) and can be expressed by a byte, a word, a double word, an integer or by a floating-point variable. Digital gates include all those variables that refer to digital status (for example an alarm conditions, a configuration option,...) and can be expressed by a single bit. Sometimes more digital conditions can be gathered in a single numeric variable, but this case will not be explained in this example. To edit the variables database, you need to run Gate Builder From Project Manager, select Gates folder and double-click on each of icons (Numeric, Digital,...). Variables database creation Suppose you need to read the following variables (to adapt this example to a real case it is enough to modify the gates details below). Name Channel Device Modbus address* Variable type Gate type Unit Description TEMP 1 1 (3:) 005 Signed Word Numeric C Temperature - Measure SP 1 1 (3:) 010 Signed Word Numeric C Temperature - Setpoint OUT 1 1 (3:) 015 Unsigned Word Numeric % Control Output - Value ALARM 1 1 (1:) 012 Bit Digitale Internal alarm status TEMP 1 2 (3:) 005 Signed Word Numeric C Temperature - Measure SP 1 2 (3:) 010 Signed Word Numeric C Temperature - Setpoint OUT 1 2 (3:) 015 Unsigned Word Numeric % Control Output - Value ALARM 1 2 (1:) 012 Bit Digital Internal alarm status * The number between brackets represents Modbus function used to read the variable (refer to protocol manual in Project Manager Help). Getting started - Creating a simple Modbus protocol application 7

8 5.1 Numeric variables configuration Repeat numeric gates configuration for both devices, having care to change device number (Device) and N ID. Numeric variable TEMP configuration TEMP numeric variable configuration General folder TEMP numeric variable configuration Sampling folder Getting started - Creating a simple Modbus protocol application 8

9 TEMP numeric variable configuration Value folder Numeric variable SP configuration SP numeric variable configuration General folder SP numeric variable configuration Sampling folder Getting started - Creating a simple Modbus protocol application 9

10 SP numeric variable configuration Value folder Numeric variable OUT configuration OUT numeric variable configuration General folder Getting started - Creating a simple Modbus protocol application 10

11 OUT numeric variable configuration Sampling folder OUT numeric variable configuration Value folder End result After you have defined all numeric variables, you should see the Gate Builder main page similar to the one shown below. Numeric variable database Getting started - Creating a simple Modbus protocol application 11

12 5.2 Digital variables configuration Repeat numeric gates configuration for both devices, having care to change device number (Device) and N ID. ALARM digital variable configuration General folder ALARM digital variable configuration Sampling folder Final result After you have defined all numeric variables, you should see the Gate Builder main page similar to the one shown below. Digital variables database Getting started - Creating a simple Modbus protocol application 12

13 5.3 Alarms gates configuration So we have created numeric and digital gates database; now we will create as example an event/alarm gate for each device. These gates are not read from devices but are software generated and their status wil be displayed in runtime as "event and alarm status" and "event and alarm history. Let's create alarm gates with the following conditions. Name Condition Filter time Message Registration Internal_Alarm,1 Alarm,1 = 1 10 s Internal_Alarm,2 Alarm,2 = 1 10 s Attention! Internal Alarm Test Device#1 Attention! Internal Alarm Test Device#2 yes yes Configuration of alarm gate Internal_Alarm Internal_Alarm ALARM gate configuration General folder Internal_Alarm ALARM gate configuration Condition folder Getting started - Creating a simple Modbus protocol application 13

14 Internal_Alarm ALARM gate configuration Message folder Final result After you have defined all numeric variables, you should see the Gate Builder main page similar to the one shown below. Alarm gates database Getting started - Creating a simple Modbus protocol application 14

15 6. Creating a template Now supervision network has been set; we have defined the logical channel and its link to PC COM port and we have connected it to Modbus RTU protocol; we have linked to this channel two devices (Test Device#1 e Test Device#2); for both we have declared sampling variables and alarm/event internal variables. Now it is the moment to build a template for the application. Select Template folder and create a new template, selecting the item New>File from Edit menu. Rename the just created template using the name Main, do this selecting it and then using Rename item from Edit menu. Template creating Double-clicking on created template, Template Builder start in order to build the graphic page. 6.1 Declaring template variables First it is necessary to declare which variables we will use in the template; in this example we will use all of them. Click on button alongside of the Gates item in the Property Editor (Property Editor is the window on the left side of the screen that allows to modify template elements properties). A new windows will appear; press Add gate button, select the first numeric gate and press Ok. Repeat this operation for each numeric, digital and alarm gate that belongs to the application. Getting started - Creating a simple Modbus protocol application 15

16 Template variables declaration 6.2 Inserting a Label object Firstly build a Frame that will contain all the elements that will be inserted later. To do this, select Frame object among the ones on the upper bar ( template, a void rectangle will be displayed., it is the first on the left) and click on the The next step is to insert into the created frame a static label that is a static text; select Label object among the ones on the upper bar ( ), then click into the frame. To modify the text displayed into the object, use Property Editor, click alongside of the property Label and digit TEMPERATURE. Alongside of just inserted label, position another one to visualise temperature read form the device. To link the Label to the numeric variable TEMP, click on the button Editor and select NUM,Temp,1 among the available gates. Modify in addition the property Label inserting %5.0lf C. Every described object can be formatted and placed as you like using Property Editor. alongside of the item Gate in Property Getting started - Creating a simple Modbus protocol application 16

17 Label object inserting 6.3 Inserting an Edit object Insert another Label, positioning it below TEMPERATURE and modify the text in SETPOINT A control will be inserted that will allow to modify the value of the SP gate and to send it to the device. Select Edit ) object from tool bar; and, as done before, link it to NUM,Sp,1 gate using the Property Editor. Edit object inserting Getting started - Creating a simple Modbus protocol application 17

18 6.4 Inserting a Gauge object Insert another Label, positioning it below SETPOINT and modify the text in OUTPUT. Insert now a Gauge object ( ) alongside of the previous Label; link it to NUM,Out,1 gate using the Property Editor. In this way the value of the device output power will be displayed in bar format. Gauge object inserting 6.5 Inserting a Led object Insert another Label, positioning it below OUTPUT and modify the text in INTERNAL ALARM. Insert now a Led ( ).alongside of the previous Label. To "give animation" to the object it is necessary to specify which is the condition that make it change colour; modify Led ON conditions property linking led activation condition to Internal_Alarm,1 (Internal_Alarm,1 == true) alarm activation. A red led will be shown in presence of the alarm, otherwise led will be green. Getting started - Creating a simple Modbus protocol application 18

19 Led object inserting 6.6 Completing template All variables read from device 1 are now displayed; to display also device 2 variables it is enough to select the Frame we have created, copy and paste it in the template. Be careful to not paste it in the source frame; to avoid this mistake click in a free object area of the template before pasting it. Now we have only to modify variables links in Label, Edit, Gauge and Led objects to obtain a supervision interface for the Test Device #2. Two devices supervision template To complete the template, insert now a BkBitmap object (background bitmap, ) previously created using any graphic design software (for example Paint) and saved in project Bitmaps folder. Getting started - Creating a simple Modbus protocol application 19

20 Background bitmap inserting Getting started - Creating a simple Modbus protocol application 20

21 7. Winlog Pro code example Now create the code function that allows showing the template at runtime startup. In Code folder create a file and rename it Main; opening it, Code Builder starts. Creazione di un file di codice Code Builder is the Winlog Pro programming environment; we will use it only to define a function that will open the main template at the application startup. Copy and paste the following code: // Function called at Winlog startup Function void Main() #Startup //*************************************** // Open default page //*************************************** TPageOpen("Main"); end To check syntax of the code use function Check syntax ( ). Getting started - Creating a simple Modbus protocol application 21

22 Code syntax checking Getting started - Creating a simple Modbus protocol application 22

23 8. Project execution Our example is complete. Wire devices to the serial port; to run the project, in Project Manager select Execute... from Project menu. Now we are entering in the "run-time" phase that is application execution mode. Winlog Pro samples variables from devices and processes results in graphical representations (trends and template) and in tabular representations (reports and historical data). At project startup, main template will appear automatically. From Supervision menu you can display graphical trends; select menu item Charts... and define the group of variables that you want to display as graphical trends. Again in Supervision menu you can display both the online status (Status>Alarms...) and the story (Historical>Alarms...) of all alarms that have been created with Gate Builder. Project execution Getting started - Creating a simple Modbus protocol application 23